Which of the following expressions is a polynomial? A. F(x)= -3x^4+8x^2-2 square root x+1 B. F(x) -2.1x^7+3x^2+17/2x C. F(x)= 4/x-11x^2 D. F(x)= -1/5x^2+4.5x+2^x

What is the answer to the question 5x+2x

Need plz been trying to do it for a long time and still haven’t succeeded

Fred and gene are hang gliding. fred is 700 feet above the ground and descending at 15 ft/s. gene is decending as shown in the table. interpret the rates of change and initial values of the linear functions in terms of the situations they model. show all work. freds equation is f(x)=-15x+700. ( genes is the table attached)